Improvement in attaching hair-springs to watch-balances



J. SHAW.

Attaching Hair-Springs to Watch-Balances.

No.135,248, I PatentedJ'an.28,1873.

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WITNESSEs INVENTOR. 1/4 zzacifj //*/Z/%z; @1 1 UNITED STATES PATENTOFFIcE.

JACOB SHAW, OF SHELBY, OHIO.

IMPROVEMENT IN ATTACHING HAIRSPRINGS TO WATCH-BALANCES.

Specification forming part of Letters Patent No. 135,248, dated January28, 1873.

To all whom it may concern:

Be it known that I, JACOB SHAW, of Shelby, county of Richland and Stateof Ohio, have invented an Improvement in the Method of AttachingHair-Springs to Balance-\Vheels, of which the following is aspecification:

This invention relates to an improved manner of attaching hair-springsto balance-wheel staff in watches whereby the tension of the spring maybe regulated.

The old method of passing the end of the spring through a hole in a studand securing it with a pin inserted in the same hole and in line withthe spring is attended with difficulty in retaining the spring in properplace or position.

Referring to the drawing, Figure l is a plan View of a watch having myimprovements attached. Fig. 2 is a detached View of balance andbalance-spring in plan and section. Figs. 3, 4, 5, 6, 7, and 8 arevarious modifications of constructing the clamp or vise. The scale inFigs. 1 and 2 is twice the natural size, and that of the other figuresfour times the natural size, of the parts.

A represents the upper plate of a watch.

B is the balance-bridge. G is a balance. D is a balance hair-spring. E,Fig. 2, is the balance-staif to which the inner end of the spring 1) isattached.

My improvement is as follows: On the up" .it and the plate F. The tubemay be turned on the stafi' without unscrewing the hat for adjusting thespring.

Having described my invention, what I desire to secure by LettersPatent, is-

The plate F and tube, and the nut G in C011} bination with the spring Dand the balancestaft' E, substantially as shown and described, and forthe purpose set forth.

JACOB SHAXV. Witnesses:

GEO. XV. TIBnITTs, N. N. SPAFFORI).

